Dude, learn to read...
Go to the mods tab in the menu and hit the "show mod path" button.
Check it out and see where it leads.
If it goes to your C: drive, you screwed yourself by not buying a new internal drive. You might be nice and ask someone if they know how to change the mod path.
but...
If your user account is on the other drive (My Documents etc.) though, I think it should put it on the other drive okay though.
If it goes to D: drive, then go to your user folder there and follow the remainder of the path as described in New Eden, cause it should be structured about the same.
ok well i said my c drive was too small so you shouldn't have wasted your time posting useless information
Next time, buy a reasonably built computer and be polite. We're not all great about it, but when someone's trying to be helpful, it's no call for impoliteness.